Made by chemical method&comma; or &lpar;and&rpar; hybrid method of crop nutrition elements nitrogen&comma; phosphorus and potassium in any of the two or three kinds of fertilizer&period;Its action is to meet different production under the condition of agriculture needs the comprehensive needs and balance of various nutrients&period;Their specifications according to the content of N&comma; P2O5&comma; K2O percentage markup&comma; such as said the compound fertilizer containing N&comma; P2O5&comma; K2O 15&percnt; each&period;Compound fertilizer also can contain one or more of the following amount and &lpar;or&rpar; in trace nutrition elements&comma; such as the picture compound fertilizer containing N&comma; P2O5&comma; K2O each 12&percnt;&comma; also contains the S5 &percnt;&period;

In the United States&comma; compound fertilizer and mixed fertilizer are synonymous&period;In some European countries both have different meanings&comma; compound fertilizer significant chemical reactions occurred during the production process&comma; such as ammonium phosphate fertilizer&comma; phosphate fertilizer nitrate&comma; potassium nitrate and potassium phosphate&comma; etc&period;In the process of production is simply bulk-blended fertilizers mechanical mixing&period;In the production of compound fertilizer raw material is some basic fertilizer and intermediate products&period;Mainly include &comma; ammonium sulfate&comma; urea&comma; calcium superphosphate&comma; heavy calcium superphosphate&comma; ammonium phosphate fertilizer&comma; potassium chloride&comma; potassium sulfate and ammonia&comma; all kinds of nitrogen and phosphate solution&period;